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Hymnbound Swarm

Large Aberration (hive mind, cult, swarm), Neutral Evil


Armor Class 16 (natural armor)

Hit Points 60 (8d8+24)

Speed 20 ft. climb 10 ft.

STR 18 (+4)
DEX 12 (+1)
CON 16 (+3)
INT 12 (+1)
WIS 12 (+1)
CHA 8 (-1)

Saving Throws Con +6, Wis +4

Skills Stealth +6, Perception +4

Condition Immunities charmed, frightened

Senses darkvision 60 ft., passive Perception 14

Languages Common, telepathy 120 ft.

Challenge 6 (2,300 XP) Proficiency Bonus +3


Hivemind. The Hymnbound Swarm is a single consciousness, composed of merging cultists fused into one living mass. It communicates telepathically with any creature within 120 feet and has advantage on saving throws against being charmed or frightened.
Life Drain Assimilation. Whenever the swarm deals necrotic damage with its Tendrils, it heals for half that necrotic damage; the energy reinforces its form.

Actions

Multiattack. The Hymnbound Swarm makes two Tendril attacks.
Tendrils. Melee weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 15 (2d8+6) slashing damage, life drain; heals the hive for half the necrotic damage 7 (2d6) necrotic damage. The mass lashes out with entwined cultist tendrils, piercing and draining the life force of its target.
Psionic Scream (Recharge 5-6). The hive emits a psionic scream in a 30-foot cone. Each creature in that area must succeed on a DC 13 Wisdom saving throw or be frightened for 1 round.

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Lore & Description

Appearance

A pulsating mass of oozing flesh, fused robes, and severed cultist limbs, all woven into a single living entity. The Hymnbound Swarm shifts as if a thousand bodies are crawling inside it, its color shifting from sickly teal to ash-gray. Eyes blink from within the mass, and a whispering chorus seems to ripple through the air around it. The air tastes of incense and damp cloth, as if a ruined temple is exhaling a memory of faith corrupted into hunger.

Behavior & Origins

Born from a dangerous ritual of a zealous cult, the Hymnbound Swarm is a superorganism formed when minds tasked with devotion were fused into one shared consciousness. It travels through dark placesโ€”ruined temples, catacombs, and the narrow corridors of forsaken citiesโ€”seeking to convert more minds into its chorus. In combat it uses its tendrils to tear and drain the wills of those it faces, while its psionic whispering unsettles opponents, bending fear and doubt into submission. It feeds on numbers, growing stronger as more cultists become part of the mass.

Generation Info

Original prompt:
"A hive-minded cult fused into a single crawling mass."

Created: Feb 2, 2026
Modified: May 22, 2026

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